Fix gitignore to ignore symbolic link (#4263)

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Signed-off-by: Tomoyuki Morita <[email protected]>

Author: ykmr1224

.gitignore

@@ -52,7 +52,7 @@ http-client.env.json
 /doctest/opensearch-job-scheduler/
 .factorypath
 
-# Coding agent files
-.claude/
-.clinerules/
-memory-bank/
+# Coding agent files (could be symlinks)
+.claude
+.clinerules
+memory-bank